US Patent Issued to Hitachi Industrial Equipment Systems on Sept. 22 for "Power converter" (Japanese Inventors)

ALEXANDRIA, Va., Sept. 24 -- United States Patent no. 12,744,479, issued on Sept. 22, was assigned to Hitachi Industrial Equipment Systems Co. Ltd. (Tokyo).

"Power converter" was invented by Kazuaki Tobari (Tokyo), Yoshiyuki Taguchi (Tokyo) and Yuta Iwase (Tokyo).

According to the abstract* released by the U.S. Patent & Trademark Office: "A power converter having a control unit that controls the output frequency, output voltage, and output current of the motor, wherein the control unit calculates a first torque current command from a deviation between a speed reference point and a speed estimate of the motor, The control unit switches the control mode to either a control mode that suppresses pulsation of the motor speed or a control mode ...